A. M. Ryan's research is jointly funded by the Irish Research Council and AstroTec Holding B.V. as part of the Irish Research Council Enterprise Partnership Scheme and hosted by the Dublin Institute for Advanced Studies (DIAS). E. P. Carley is supported by the Schrödinger Fellowship at DIAS. This paper is based on data obtained with the International LOFAR Telescope (ILT) under project code DDT 003. LOFAR [1]} is the Low Frequency Array designed and constructed by ASTRON. It has observing, data processing, and data storage facilities in several countries, that are owned by various parties (each with their own funding sources), and that are collectively operated by the ILT foundation under a joint scientific policy. The ILT resources have benefitted from the following recent major funding sources: CNRS-INSU, Observatoire de Paris and Université d'Orléans, France; BMBF, MIWF-NRW, MPG, Germany; Science Foundation Ireland (SFI), Department of Business, Enterprise and Innovation (DBEI), Ireland; NWO, The Netherlands; The Science and Technology Facilities Council, UK; Ministry of Science and Higher Education, Poland.
